1881.] 



ANATOMY OF THE EPOMOPHORI, 



687 



third of the neck ; and the wide space intervening between the epi- 

 glottis and the base of the tongue is seen, on removal of the integu- 

 ment, to be covered in by the mucous membrane of the pharynx 

 only. The mylo-hyoid muscle arises on each side from the thyro- 

 hyoid bone between the insertion of the sterno-hyoid musele and 

 the origin of the middle constrictor of the pharynx, and, suddenly 

 narrowing, forms a half-round fleshy tendon, which passes forwards 

 across the projecting articular extremity of the epihyal bone 

 (fig. 1, x), which acts as a pulley, and on reaching the under 



Fig. 2. 



Fig. 3. 



myjiy. 



Fig. 2. Hyoid bones and larynx of E'pomoplwrus franqiieti {enlarged), viewed 

 from above, ep.hy, epihyal bone; ccr.hy, ceratobyal bones; th.liy, 

 extremity of tbyrobyal bone ; e, epiglottis, posterior surface ; s, San- 

 torinian cartilages. 



Fig. 3. Side view of part of the hyoid bones and the larynx of Epomophortis 

 franqiicti (enlarged), showing {ph. s) part of the neck of the posterior 

 pharyngeal sac and its communication with the pharj-nx ; x, the pro- 

 minent articular extremity of the epihyal bone ; stk?/, stylo-hyoid 

 muscle; ini/.f/i/, mylo-hyoid, and f/i/.ffl, hyo-glossus muscles, divided 

 and drawn backwards ; thJiy, thyrohyal bone. 



surface of the tongue spreads out, uniting with its fellow of the 

 opposite side to form a thin muscular expansion extending between 

 the rami of the mandible almost as far forwards as the symphysis 

 menti. Immediately external to the origin of the mylo-hyoid the 

 hyo-glossus arises by a much narrower origin, and, forming a per- 

 fectly similar tendon, accompanies it forwards, but separated from it 

 by the projecting articular extremity of the epihyal bone, and, 

 curving inwards above it, is inserted into the side of the tongue. 

 The genio-hyoid and genio-hyo-glossus muscles are absent, the basi- 



